Walmart let people's go in self checkout with 15 or more in they shoppers card and liquid in the self checkout that is okay with that customer service all way close at one or two o'clock or sooner ?

Liquid yes but no alcohol. I think the limit is per store and amount of shoppers

24 hours in las vegas

Every store with self checkout has certain things you can only purchase at a register with a human. It's an ID check

Yes you can go into the self checkout with more than 15 items and if you're looking to buy liquor then that is only at 1 certain check out. The customer service section closes between 6 and 8 o'clock depending on staff.

Good question I haven't observed that yet, but I noticed that sometimes they close the doors to the outdoor plant section! At one point it was a security issue. I'll let you know as soon as I get an answer from them